Hot water heating system



Jan. 20, 1953 1.. E. ROLLINS 2,626,107

HOT WATER HEATING SYSTEM Filed Sept. 12, 1949 INVENTOR F 3. Z 4 7 ra f: Z//// s Patented Jan. 20, 1953 ST PAT E NT OFF-116E HOT WATERr HEATING SYSTEM Leonard. E; Rollins, Denveig; G010.

Applicationseptemher m, 1949', Serial"No.11'5,261

Claims.

1 This invention relates to-an improved simplifiedhot water: heat ng system. by ombinin the provision for expansion of theqwater tne circulating of the; water, the overflow. and supply of the water with the heating of the water in one container called the boiler;

One-object of the invention is to-providelmore eflicient circulation inside the boiler by allowin the returnwater to enternear the topof the boiler lwhere ituflows and is drawn down. over the heated sun-faces; of -thej boiler to the pump near the bottom of the boiler.

Another object of the invention is to both improve the heat transfer-from fire side of'=boiler surfaces to wetted side by spraying or flowing the water over a portion or all of the heated surfaces thereby increasing the velocity of the water over the surfaces as well as the heat transfer rate.

Another object of the invention is to decrease the volume of water in the system and increase the expansion space. By decreasing the volume of water to be heated the smaller volume is heated more rapidly and circulated at a higher temperature to the heating radiators, convectors and coils thus giving quicker heating to the heated spaces and less time for the fuel burner to burn fuel.

Another object of the invention is to combine the expansion space (expansion tank) within the boiler simplifying the system and reducing the water volume.

Another object of the invention is to combine the circulating pump within the boiler to simplifying the system and connections and thus reduce costs.

Another object of the invention is to leave the major part of the boiler under atmospheric pressure and only have the firepot coil under pressure greater than atmosphere thus reducing the cost, of construction and improving the circulation and performance of the boiler and system.

Referring to the drawings:

Fig. 1 is a diagram showing a closed pressure hot water system with the boiler not open to atmosphere and under a pressure of to p. s. i. with all fire and flue surfaces submerged in water.

Fig. 2 is a diagram showing a partial pressure hot water heating system with the pump creating pressure on the supply side and the boiler fitted with a loose cover and atmospheric pressure on the boiler side with all fire and flue heating surfaces submerged in water.

Fig. 3 is a diagram showing a partial pressure hot water heating system with the pump creatsprayed: oramade .tozflow over. the fire tube; and- -flue heating surfaces.

Referring specifically: to. Fig.1; the boiler;- 34 contains. water. to :be heated. andcirculated, The

combustion chamberorzflrepot 35 hastubesor'flue;

passages 36 The; boiler is; filled with; water. up,

to; a. water line 31' to; completely cover; the; flue. passage 36., The; airfllledspace 384s; 131513118X? pansionspace for; the, water towexpand; from acool to a hot. volume, The-headottheboilertfi isan integral part; o-,thet'boiler.-, Amelief valve 40. :releases {Vi/311161"; at,- a. set pressure. As.- pressure.- regulating valve 4! allows water to enter the boiler to maintain a definite pressure in the boiler. A circulating pump 42 with motor 43 circulates water through conduit 44 part of which forms a coil in the firepot or combustion chamber 35 and connects to radiators, convectors or coils 45, 46 and 41, and then back through a return conduit 48 to boiler.

Referring specifically to Fig. 2 the boiler I9 contains water to be heated and circulated. The combustion chamber or firepot is 20. The tubes or flue passages are 2!. The boiler water level 22 fluctuates as the water is hot or cold. A loose cover 23 covers the top of boiler. A float operated valve 24 maintains the water level an inch to several inches below the outlet to 26 when the water is cold and allows it to expand up to the outlet when hot with any accidental excess overflowing through 26. The space between the varying water level 22 and the cover on the boiler 23 is indicated at 25. A circulating pump 21 with motor 28 circulates the water under pressure through conduit 29 part of which forms a coil in the firepot or combustion chamber 20 and connects to radiators, convectors or coils 30, 3| and 32 and then back through a return conduit 33 which is constricted slightly at boiler to help maintain a steady pressure on the system.

Referring specifically to Fig. 3 the boiler l is partially full of water. The combustion chamber or firepot 2 has tubes or flue passages 4. The water line 3 fluctuates as the Water volume changes from hot to cold and vice versa from one to several inches below overflow ID. A float operated valve 9 automatically controls minimum levels. Any excess of water will overflow out through a trapped conduit ID. A circulating pump I2 with motor l3 draws water from the boiler and pumps it through supply conduit l4 part of which forms a coil in the firepot 2 of the boiler and out through the radiators, convectors or coils l5, l6 and I1, and back through return conduit ill to pressure chamber 6 where it is sprayed or flows over tubes or flues 4 and other hot boiler surfaces such as top of firepot 2. An open space 1 provides for the flowing or spraying Water as well as for expansion for the water. A loose cover 8 covers the top of boiler but allows the inside to be under atmospheric pressure. .A pressure switch II starts or stops the burner for the boiler.

What I claim is:

1. A hot water heating system comprising a first heat exchanger, a boiler, means for recirculating water between said boiler and heat exchanger at a relatively high velocity, a combustion chamber in said boiler, a reservoir in said boiler jacketing said combustion chamber in heatexchange relationship therewith through which water returned from said first heat exchanger is re-circulated at a relatively low velocity, a flue disposed in said reservoir and connected to said combustion chamber for removing waste products of combustion, said flue being so disposed in said 'reservoir as to be in heat-exchange relationship with water being returned from said first heat exchanger, a return line between said first heat exchanger and said reservoir, and a feed line between said reservoir and said first heat exchanger including a second heat exchanger disposed in said combustion chamber in heat-exchange relationship with the products of combustion therein through which water flows to said first heat exchanger at a relatively high velocity.

2. A hot water heating system as defined in claim 1, wherein said re-circulating means is in the form of a pump having its inlet connected to said reservoir and its outlet connected to said feed line.

3. A hot water heating system as defined in claim 1 wherein said means is in the form of a pump placing at least the high velocity portion of the system under pressure.

4. A hot water heating system as defined in claim 1 wherein said means is in the form of a pump placing the high velocity portion of said system under pressure, and means venting said reservoir to the atmosphere to provide atmospheric pressure in said reservoir.

5. A hot water heating system as defined in claim 1 wherein the discharge end of said return line is disposed in said reservoir and has nozzle portions for directing the return water in contact with said flue.

LEONARD E. ROLLINS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 218,542 Kremer Aug. 12, 1879 725,160- Smead Apr. 14, 1903 2,187,044 McBath Jan. 16, 1940 2,376,632 Sullivan May 22, 1945 FOREIGN PATENTS Number Country Date 668,091 France July 2, 1929 

